A Data Matrix code (ISO/IEC 16022) is a two-dimensional matrix barcode 
arranged in a square or rectangular format and of various sizes. It can
encode text or numeric data (with punctuation marks in some variants),
and supports various error-correction codes.

iec16022 is a library and tool to produce these barcodes. It can output
in various formats including ASCII, UTF-8, EPS and PNG.
